Orthrus
Generation VI · Two-headed watchdog of Geryon's herds
Orthrus was the two-headed hound of Typhon and Echidna's brood, brother to Cerberus, who kept faithful watch over Geryon's red cattle on Erytheia. When Heracles came for the herd during his tenth labour, Orthrus charged first and fell first, struck down by the hero's club before his master met the same fate.